The 4 Row 43 Tuft Bristle A transitional brush for people accustomed to using a hard bristle brush. Tightly spaced tufts feel firm, but are made with POH soft bristles. This layout is for people new to personal oral hygiene, who like the sensation of the hard toothbrush they have been using. The bristle tufts are laid out in a densely packed design, allowing little or no bending of individual filaments which provides the firmer feel, but with soft, end rounded polished bristle tips.